title: Highly hydrophilic polyvinylidene fluoride (PVDF) ultrafiltration membranes via postfabrication grafting of surface-tailored silica nanoparticles.
abstract: Polyvinylidene fluoride (PVDF) has drawn much attention as a predominant ultrafiltration (UF) membrane material due to its outstanding mechanical and physicochemical properties. However, current applications suffer from the low fouling resistance of the PVDF membrane due to the intrinsic hydrophobic property of the membrane. The present study demonstrates a novel approach for the fabrication of a highly hydrophilic PVDF UF membrane via postfabrication tethering of superhydrophilic silica nanoparticles (NPs) to the membrane surface. The pristine PVDF membrane was grafted with poly(methacrylic acid) (PMAA) by plasma induced graft copolymerization, providing sufficient carboxyl groups as anchor sites for the binding of silica NPs, which were surface-tailored with amine-terminated cationic ligands. The NP binding was achieved through a remarkably simple and effective dip-coating technique in the presence or absence of the N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride (EDC)/N-hydroxysuccinimide (NHS) cross-linking process. The properties of the membrane prepared from the modification without EDC/NHS cross-linking were comparable to those for the membrane prepared with the EDC/NHS cross-linking. Both modifications almost doubled the surface energy of the functionalized membranes, which significantly improved the wettability of the membrane and converted the membrane surface from hydrophobic to highly hydrophilic. The irreversibly bound layer of superhydrophilic silica NPs endowed the membranes with strong antifouling performance as demonstrated by three sequential fouling filtration runs using bovine serum albumin (BSA) as a model organic foulant. The results suggest promising applications of the postfabrication surface modification technique in various membrane separation areas.
authors.affiliation: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Liang
authors.forename: Yan
authors.initials: Y
authors.lastname: Kang
authors.forename: Alberto
authors.initials: A
authors.lastname: Tiraferri
authors.forename: Emmanuel P
authors.initials: EP
authors.lastname: Giannelis
authors.forename: Xia
authors.initials: X
authors.lastname: Huang
authors.forename: Menachem
authors.initials: M
authors.lastname: Elimelech
mesh_terms: D000818:Animals; D057219:Biofouling; D002417:Cattle; D057927:Hydrophobic and Hydrophilic Interactions; D008567:Membranes, Artificial; D053758:Nanoparticles / Q000737:chemistry*; D010539:Permeability; D058105:Polymerization; D011109:Polymethacrylic Acids / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry*; D012710:Serum Albumin, Bovine / Q000737:chemistry / Q000302:isolation & purification; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties; D014462:Ultrafiltration; D014867:Water / Q000737:chemistry; D005465:Fluorocarbon Polymers
chemical_list: D008567:Membranes, Artificial; D011109:Polymethacrylic Acids; D011145:Polyvinyls; D012710:Serum Albumin, Bovine; D012822:Silicon Dioxide; D014867:Water; C024865:polyvinylidene fluoride; D005465:Fluorocarbon Polymers; C030613:polymethacrylic acid